A thin convergent glass lens `(mu_g=1.5)` has a power of `+5.0D.` When this lens is immersed in a liquid of refractive index `mu_1,` it acts as a divergent lens of focal length `100 cm.` The value of `mu_1` is
A. `(4)/(3)`
B. `(3)/(2)`
C. `(5)/(3)`
D. `2`